StarDust wrote:
Moon floats in vacuum

No. It is incorrect, although arguably poetic, to describe motion in vacuum
as “floating”. Floating requires a substance to float on (e.g. water) or in
(e.g. air), but “vacuum” means the absence of any substance.

and earth gravity holding it in orbit!

[The proper terms are “the Moon” and “Earth” (NOT “the Earth” or “[the]
earth”). I am using the Latin names, “Luna” and “Terra”, respectively,
here instead.]

No. An interaction is always mutual. Actually, one body never orbits the
other, but two orbit around their common center of mass. In the case of
Terra and Luna though, the common center of mass lies c. 1'700 km (1'100 mi)
beneath Terra’s surface, so it appears as if Luna would orbit Terra.

Because of the size of Luna (the lunar radius is more than a quarter of the
Terran) Terra–Luna can be called a double planet. However, under the
definition that the common center of mass of such a system must lie outside
both bodies, it would not be.

I'm saying to move Moons orbit maybe hundred thousand miles out!

This is already happening, slowly, as Luna loses angular momentum due to
tidal friction. Lunar Laser Ranging (LLR) shows that the Terra–Luna
distance is increasing by 38 mm (1.5 in) per year. So enjoy those total
solar eclipses while you still can ;-)

Note that there will be problems for Terra if you want to “play god” and
simply move the lunar orbit at once. At its current speed, Luna would be
too fast to be held in orbit and run away. The tides would be much weaker
which would influence life on Terra in a major way.

Assuming that you would somehow also slow the lunar orbital speed at once to
the right measure, then this would mean, as angular momentum is preserved,
that days on Earth would be much longer than they are today (this is already
happening, slowly, by c. 15 µs/a).

--
PointedEars

Twitter: @PointedEars2
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